Set screw apparatus

ABSTRACT

In various examples, a set screw apparatus includes a set screw including a set screw body. An abutment extends radially outwardly from the set screw body and longitudinally separated from a threaded set screw area of a first length by an unthreaded set screw area of a second length of the set screw body. A block includes a bore. A threaded block area includes a third length, wherein the abutment inhibits movement of the set screw past the threaded block area and removal of the set screw from the bore. The third length is shorter than the second length so that an entirety of the threaded block area can be disposed within the unthreaded set screw area, such that the set screw is freely rotatable within the bore, but retained within the bore, if turned in a first direction with respect to the block.

BACKGROUND

The present invention relates to a set screw apparatus, and morespecifically relates to a set screw apparatus for retaining a therapydelivery element with respect to a device.

Implantable medical devices often include headers having set screw andblock assemblies for retaining leads and other such devices inconnection with the implantable medical devices. However, if the setscrew is completely backed out of the block, the set screw willdisengage from and potentially fall out of the block. The set screw canoften be very difficult, if not impossible, to re-engage within theblock. If the set screw is able to be re-engaged within the blocks,doing so costs valuable time and effort. If the set screw is unable tobe re-engaged, the implantable medical device might have to be replaced,which, in addition to costing time and effort, can cost a considerableamount of money. Moreover, if the set screw falls out of the block andinto the patient, time and effort must be spent to locate the set screwand remove the set screw from within the patient. There also exists apossibility of potential health issues arising from the set screwfalling into the patient.

OVERVIEW

This overview is intended to provide an overview of subject matter ofthe present patent application. It is not intended to provide anexclusive or exhaustive explanation of the invention. The detaileddescription is included to provide further information about the presentpatent application.

The present inventors have recognized, among other things, that setscrew apparatuses can be configured to retain a set screw within a blockeven when threads of the set screw are completely backed out fromthreads of the block. In this way, the possibility of the set screwfalling out of the block is reduced, if not eliminated, therebyreducing, if not eliminating, additional costs, time, effort, or healthcomplications associated with the set screw falling out of the blockand/or the re-engagement of the set screw with the block or thereplacement of the device with which the set screw apparatus isassociated. To better illustrate the apparatuses and methods describedherein, a non-limiting list of examples is provided here:

Example 1 can include subject matter that can include a set screwapparatus including a set screw and a block. The set screw includes aset screw body. One or more set screw threads extend radially outwardlyfrom the set screw body and are disposed along a threaded set screw areaof the set screw body. The threaded set screw area includes a firstlength measured longitudinally along the set screw body. An abutmentextends radially outwardly from the set screw body and is longitudinallyseparated from the threaded set screw area by an unthreaded set screwarea of the set screw body. The unthreaded set screw area includes asecond length measured longitudinally along the set screw body. Theblock includes a bore sized and shaped to accept the set screw withinthe bore. One or more block threads extend radially inwardly from thebore and are disposed along a threaded block area of the bore. The oneor more block threads are complementary with the one or more set screwthreads so as to be threadably engageable with the one or more set screwthreads. The threaded block area includes a third length measuredlongitudinally along the bore, wherein the abutment is sized and shapedto abut, but not threadably engage with, the one or more block threadsto inhibit movement of the set screw past the threaded block area andremoval of the set screw from the bore. The third length is shorter thanthe second length so that an entirety of the threaded block area can bedisposed within the unthreaded set screw area between the threaded setscrew area and the abutment, such that, with the threaded block areadisposed within the unthreaded set screw area the set screw is freelyrotatable within the bore, but retained within the bore, if turned in afirst direction with respect to the block, and the one or more set screwthreads are threadably engageable with the one or more block threads tomove the set screw in an inward direction with respect to the block withthe set screw turned in a second direction with respect to the block.

In Example 2, the subject matter of Example 1 is optionally configuredsuch that the abutment is integrally formed with the set screw body.

In Example 3, the subject matter of any one of Examples 1-2 isoptionally configured such that the set screw body includes acylindrical shape.

In Example 4, the subject matter of any one of Examples 1-3 isoptionally configured such that the set screw body is substantiallytubular.

In Example 5, the subject matter of any one of Examples 1-4 isoptionally configured such that the abutment is disposed proximate adistal end of the set screw body.

In Example 6, the subject matter of any one of Examples 1-5 isoptionally configured such that the abutment is substantially annular.

In Example 7, the subject matter of any one of Examples 1-6 isoptionally configured such that the threaded set screw area is disposedat a proximal end of the set screw body.

In Example 8, the subject matter of any one of Examples 1-7 isoptionally configured such that the block includes a passage fluidlycoupled with the bore. The passage is configured to selectively accept aproximal end of a therapy delivery element, wherein, with the proximalend of the therapy delivery element disposed within the passage,rotation of the set screw in the second direction with respect to theblock causes the set screw to move in the inward direction with respectto the block to bear against the proximal end of the therapy deliveryelement.

In Example 9, the subject matter of Example 8 is optionally configuredsuch that the passage is oriented within the block substantiallyperpendicularly to the bore.

In Example 10, the subject matter of any one of Examples 1-9 isoptionally configured such that the set screw includes a tool engagementopening configured to accept at least a portion of a tool within thetool engagement opening to facilitate rotation of the set screw withrespect to the block.

In Example 11, the subject matter of Example 10 is optionally configuredsuch that the tool engagement opening is configured to allow engagementof at least the portion of the tool with the tool engagement openingfrom a proximal end of the set screw body and from a distal end of theset screw body.

In Example 12, the subject matter of Example 10 is optionally configuredsuch that the tool engagement opening extends entirely through the setscrew body to allow engagement of at least the portion of the tool withthe tool engagement opening from the proximal end of the set screw bodyand from the distal end of the set screw body.

Example 13 can include, or can optionally be combined with any one ofExamples 1-12 to include subject matter that can include a set screwapparatus including a set screw and a block. The set screw includes aset screw body including a proximal end and a distal end. One or moreset screw threads extend radially outwardly from the set screw body andare disposed along a threaded set screw area of the set screw body. Thethreaded set screw area includes a first length measured longitudinallyalong the set screw body. The threaded set screw area is disposed at theproximal end of the set screw body. An abutment extends radiallyoutwardly from and is integrally formed with the set screw body and islongitudinally separated from the threaded set screw area by anunthreaded set screw area of the set screw body. The unthreaded setscrew area includes a second length measured longitudinally along theset screw body. The abutment is disposed proximate the distal end of theset screw body. A tool engagement opening is disposed within the setscrew body. The tool engagement opening is configured to accept at leasta portion of a tool within the tool engagement opening. The toolengagement opening extends entirely through the set screw body to allowengagement of at least the portion of the tool with the tool engagementopening from the proximal end of the set screw body and from the distalend of the set screw body. The block includes a bore sized and shaped toaccept the set screw within the bore. One or more block threads extendradially inwardly from the bore and are disposed along a threaded blockarea of the bore. The one or more block threads are complementary withthe one or more set screw threads so as to be threadably engageable withthe one or more set screw threads. The threaded block area includes athird length measured longitudinally along the bore, wherein theabutment is sized and shaped to abut, but not threadably engage with,the one or more block threads to inhibit movement of the set screw pastthe threaded block area and removal of the set screw from the bore. Thethird length is shorter than the second length so that an entirety ofthe threaded block area can be disposed within the unthreaded set screwarea between the threaded set screw area and the abutment, such that,with the threaded block area disposed within the unthreaded set screwarea the set screw is freely rotatable within the bore, but retainedwithin the bore, if turned in a first direction with respect to theblock, and the one or more set screw threads are threadably engageablewith the one or more block threads to move the set screw in an inwarddirection with respect to the block with the set screw turned in asecond direction with respect to the block.

In Example 14, the subject matter of Example 13 is optionally configuredsuch that the set screw body includes a cylindrical shape.

In Example 15, the subject matter of any one of Examples 13-14 isoptionally configured such that the set screw body is substantiallytubular.

In Example 16, the subject matter of any one of Examples 13-15 isoptionally configured such that the abutment is substantially annular.

In Example 17, the subject matter of any one of Examples 13-16 isoptionally configured such that the block includes a passage fluidlycoupled with the bore. The passage is configured to selectively accept aproximal end of a therapy delivery element, wherein, with the proximalend of the therapy delivery element disposed within the passage,rotation of the set screw in the second direction with respect to theblock causes the set screw to move in the inward direction with respectto the block to bear against the proximal end of the therapy deliveryelement.

In Example 18, the subject matter of Example 17 is optionally configuredsuch that the passage is oriented within the block substantiallyperpendicularly to the bore.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of a set screw apparatus inaccordance with at least one example of the invention.

FIG. 2 is a side view of a set screw in accordance with at least oneexample of the invention.

FIG. 3 is a cross-sectional view of a block in accordance with at leastone example of the invention.

FIG. 4 is a perspective view of a set screw apparatus in accordance withat least one example of the invention.

FIG. 5 is a cross-sectional view of a set screw apparatus in accordancewith at least one example of the invention.

FIG. 6 is a cross-sectional perspective view of a set screw apparatus inaccordance with at least one example of the invention.

FIG. 7 is a cross-sectional perspective view of a set screw apparatus inaccordance with at least one example of the invention and showing motionof a set screw threadably engaged with a block.

FIG. 8 is a cross-sectional perspective view of a set screw apparatus inaccordance with at least one example of the invention and showing motionof a set screw not threadably engaged with a block.

DETAILED DESCRIPTION

The present patent application relates to a set screw apparatus. Invarious examples, as described herein, the set screw apparatus isconfigured to retain a therapy delivery element (or an extension for atherapy delivery element) with respect to a device. In various examples,as described herein, the set screw apparatus includes a set screw thatwill be retained within a block even if the set screw is backed outcompletely from the block. In this way, the examples of set screwapparatuses described herein can reduce, if not eliminate, expendituresof time, effort, and/or money due to set screws being completely backedout of and disengaged from the blocks (accidentally or otherwise).

Although the examples of set screw apparatuses are mostly describedherein with respect to retention of a therapy delivery element (or anextension for a therapy delivery element) within a medical device, itshould be noted that this is for the sake of convenience and should notbe limited as such. The present subject matter can be applied toretention of devices other than therapy delivery elements with respectto medical devices. Moreover, the present subject matter can be appliedto areas other than the medical device area. For instance, the presentsubject matter can be applied to any set screw configuration.

Referring to FIGS. 1-4, in some examples, a set screw apparatus 100 isconfigured to retain a device, such as, but not limited to, a therapydelivery element (or an extension for a therapy delivery element), on,in, or otherwise with respect to another device, such as, but notlimited to, a pulse generator. In some examples, the set screw apparatus100 is configured to be implemented in a header or other such assemblyof a medical device, the header or other such assembly being configuredto accept and/or retain one or more therapy delivery elements (orextensions). In some examples, the set screw apparatus 100 includes aset screw 120 and a block 140 configured to accept the set screw 120.

In some examples, the set screw 120 includes a set screw body 122. Insome examples, the set screw body 122 includes a cylindrical shape. Theset screw body 122, in some examples, includes a distal end 122A and aproximal end 122B. In some examples, the proximal end 122B of the setscrew body 122 includes a tool engagement opening 121. Although shown asa hexagonal opening in the figures, it is contemplated that the toolengagement opening 121 include any shape to accommodate a tool forrotating the set screw 120 with respect to the block 140, such as, butnot limited to a hex wrench, a slot head screw driver, a Phillips headscrew driver, a hexalobular wrench, or the like.

In some examples, the tool engagement opening 121 extends a distanceinto the set screw body 122. In further examples, the tool engagementopening 121 extends entirely through the set screw body 122 from theproximal end 122B to the distal end 122A. In some examples, the setscrew body 122 is substantially tubular. In some examples, with the toolengagement opening 121 extending entirely through the set screw body122, it allows access to the tool engagement opening 121 from both thedistal end 122A and the proximal end 122B of the set screw 120.Providing access to the tool engagement opening 121 from the distal end122A facilitates initial insertion and threading of the set screw 120into the block 140 to assemble the set screw apparatus 100, which, insome examples, is accomplished by inserting the set screw into the bore142 from a bottom of the block 140 and rotating the set screw 120 withrespect to the block 140 using a corresponding tool within the toolengagement opening 121 at the distal end 122A of the set screw 120. Insome examples, the tool engagement opening 121 extending entirelythrough the set screw body 122 allows for a larger amount of surfacearea against which a corresponding tool interacts to rotate the setscrew 120 with respect to the block 140 than if the tool engagementopening extended only partially through the set screw. The larger amountof surface area, in some examples, can reduce the possibility ofstripping or otherwise damaging the tool engagement opening 121 of theset screw 122 by distributing forces encountered during rotation of theset screw 120 using a corresponding tool over a larger area. In someexamples, the set screw can include separate tool engagement openings ateach of the distal end and the proximal end, such that the toolengagement openings are not fluidly coupled with one another. That is,one tool engagement opening extends from the proximal end of the setscrew a distance into the set screw, and the other tool engagementopening extends from the distal end of the set screw a distance into theset screw without intersecting the tool engagement opening of theproximal end. Such an arrangement would allow for rotation of the setscrew from both the proximal end and the distal end using acorresponding tool, while, at the same time, not providing an openpathway through the set screw between the distal end and the proximalend. It should be understood that, in various examples, the toolengagement opening 121 can be configured in various ways, provided thatthe tool engagement opening 121 allows a user to rotate the set screw120 with respect to the block 140 using a corresponding tool, forinstance, to tighten the set screw 120 against a portion of a therapydelivery element (or extension) in order to retain the therapy deliveryelement (or extension) with a medical device or to loosen the set screw120, for instance, to remove the therapy delivery element (or extension)from the medical device.

In some examples, the set screw 120 includes one or more set screwthreads 125 extending radially outwardly from the set screw body 122 anddisposed along a threaded set screw area 124 of the set screw body 122.The threaded set screw area 124, in some examples, includes a firstlength L1 (FIG. 2) measured longitudinally along the set screw body 122.In some examples, the threaded set screw area 124 is disposed at theproximal end 122B of the set screw body 122. In other examples, thethreaded set screw area can be disposed at any point along the set screwbody 122.

In some examples, the set screw 120 includes an abutment 128 extendingradially outwardly from the set screw body 122 and longitudinallyseparated from the threaded set screw area 124 by an unthreaded setscrew area 126 of the set screw body 122. In some examples, theunthreaded set screw area 126 includes a second length L2 (FIG. 2)measured longitudinally along the set screw body 122. In some examples,the abutment 128 is integrally formed with the set screw body 122. Insome examples, the abutment 128 is disposed proximate the distal end122A of the set screw body 122. The abutment 128, in some examples, issubstantially annular. In some examples, the abutment 128 extends fromthe set screw body 122 completely around the set screw body 122. In someexamples, the abutment extends partially around the set screw body. Insome examples, the abutment is segmented around or partially around theset screw body.

Referring now to FIGS. 1-6, in some examples, the block 140 includes abore 142 sized and shaped to accept the set screw 120 within the bore142. In some examples, the block 140 includes one or more block threads145 extending radially inwardly from the bore 142 and disposed along athreaded block area 144 of the bore 142. The one or more block threads145, in some examples, are complementary with the one or more set screwthreads 125 so as to be threadably engageable with the one or more setscrew threads 125, such that rotation of the set screw 120 with respectto the block 140 causes the set screw 120 to move longitudinally withinthe bore 142 along arrow X (FIG. 5).

Referring briefly to FIGS. 7 and 8, in some examples, rotation of theset screw 120 with respect to the block 140 in a first direction Acauses the set screw 120 to move longitudinally within the bore 142along arrow Y. In some examples, rotation of the set screw 120 withrespect to the block 140 in a second direction B causes the set screw120 to move longitudinally within the bore 142 along arrow Z. In someexamples, the first direction A is opposite the second direction B. Insome examples, the direction A is counterclockwise, and the direction Bis clockwise. In this way, rotation of the set screw 120 moves the setscrew 120 outwardly (along the arrow Y) or inwardly (along the arrow Z)with respect to the bore 142, for instance, to release or retain,respectively, a portion of a therapy delivery element (or extension)within the block 140 using the set screw 120.

Referring again to FIGS. 1-6, in some examples, the threaded block area144 includes a third length L3 (FIG. 3) measured longitudinally alongthe bore 142. In some examples, the abutment 128 is sized and shaped toabut, but not threadably engage with, the one or more block threads 145.In this way, this configuration inhibits movement of the set screw 120past the threaded block area 144 and removal of the set screw 120 fromthe bore 142.

Referring to FIGS. 2, 3, 7, and 8, in some examples, the third length L3is shorter than the second length L2 so that an entirety of the threadedblock area 144 can be disposed within the unthreaded set screw area 126between the threaded set screw area 124 and the abutment 128. In thisway, with the threaded block area 144 disposed within the unthreaded setscrew area 126, as is seen in FIG. 8, the set screw 120 is freelyrotatable within the bore 142, but retained within the bore 142, ifturned in the first direction A with respect to the block 140. That is,once the threaded block area 144 is disposed within the unthreaded setscrew area 126, rotation of the set screw 120 in the first direction Aceases to produce movement in the outward direction Y of the set screw120 with respect to the bore 142 because the one or more set screwthreads 125 are no longer threadably engaged with the one or more blockthreads 145 and/or because the abutment 128 is inhibiting the set screw120 from moving farther in the outward direction Y with respect to thebore 142. However, the one or more set screw threads 125 are threadablyengageable with the one or more block threads 145 to move the set screw120 in the inward direction Z with respect to the block 140 with the setscrew 120 turned in the second direction B with respect to the block140.

Referring to FIGS. 4-8, in some examples, the block 140 includes apassage 146 fluidly coupled with the bore 142. In some examples, thepassage 146 is oriented within the block 140 substantiallyperpendicularly to the bore 142. In some examples, the passage 146 isconfigured to selectively accept a proximal end of a therapy deliveryelement (or extension). With the proximal end of the therapy deliveryelement (or extension) disposed within the passage 146, in someexamples, rotation of the set screw 120 in the second direction B withrespect to the block 140 causes the set screw 120 to move in the inwarddirection Z with respect to the block 140 to bear against the proximalend of the therapy delivery element. In some examples, one or morepassages 146 of one or more blocks 140 can be disposed within a header(for instance, of a medical device), the number of blocks 140 andpassages 146 corresponding to a number of therapy delivery elements (orextensions) that are to be attached to the header. In some examples, theset screw apparatus 100 can be used with an implantable medical device.

In this way, in some examples, the set screw 120 can be used to retainthe proximal end of the therapy delivery element (or extension) withinthe block 140. For instance, in some examples, prior to inserting theproximal end of the therapy delivery element (or extension) into thepassage 146 (or in order to remove an already-inserted proximal end ofthe therapy delivery element or extension from the passage 146), the setscrew 120 can be rotated in the first direction A to move the set screw120 in the outward direction Y with respect to the bore 142 and thepassage 146 and leave the passage 146 unobstructed by the set screw 120(FIG. 5). Because of the configuration of the set screw 120 of thepresent subject matter, in some examples, a physician or other userrotating the set screw 120 need not worry about the set screw 120releasing, dislodging, or otherwise falling out of the block 140 if thephysician or other user rotates the set screw 120 more than is necessaryin the first direction A. In some examples, instead of releasing,dislodging, or otherwise falling out of the block 140, with the threadedblock area 144 disposed within the unthreaded set screw area 126, theset screw 120 will become captive in the block 140 and freely rotatewith respect to the block 140 when rotated in the first direction A. Insome examples, the abutment 128 inhibits the set screw 120 from beingremoved from within the bore 140, for instance, if an outward force isapplied to the set screw. In various examples, such an outward forceapplied to the set screw 120 could result from gravity if the set screwapparatus 100 is held with the set screw 120 facing in a substantiallydownward direction, from higher pressure within the block 140 thanoutside the block 140, from a pulling force applied to the set screw120, or the like. With the passage 146 unobstructed by the set screw120, the proximal end of the therapy delivery element (or extension) canbe inserted within (or removed from) the passage 146. If inserting theproximal end of the therapy delivery element (or extension), onceinserted, the physician or other user can rotate the set screw 120 inthe second direction B to move the set screw 120 in the inward directionZ to allow the set screw 120 to contact and bear against the proximalend of the therapy delivery element (or extension), thereby positivelyengaging the proximal end of the therapy delivery element (or extension)with the set screw apparatus 100 and retaining or helping to retain theproximal end of the therapy delivery element (or extension) within theheader or other device with which the set screw apparatus 100 is beingused.

The present inventors have recognized various advantages of the subjectmatter described herein. For instance, in some examples, the set screwapparatus retains the set screw within the block even when the threadsof the set screw are completely backed out from the threads of theblock. In this way, the possibility of the set screw falling out of theblock is reduced, if not eliminated, thereby reducing, if noteliminating, additional costs, time, effort, or health complicationsassociated with the set screw falling out of the block and/or there-engagement of the set screw with the block or the replacement of thedevice with which the set screw apparatus is associated. While variousadvantages of the example apparatuses are listed herein, this list isnot considered to be complete, as further advantages may become apparentfrom the description and figures presented herein.

Although the subject matter of the present patent application has beendescribed with reference to various examples, workers skilled in the artwill recognize that changes can be made in form and detail withoutdeparting from the scope of the subject matter recited in the belowclaims.

The above Detailed Description includes references to the accompanyingdrawings, which form a part of the Detailed Description. The drawingsshow, by way of illustration, specific examples in which the presentapparatuses and methods can be practiced. These embodiments are alsoreferred to herein as “examples.”

The above Detailed Description is intended to be illustrative, and notrestrictive. For example, the above-described examples (or one or moreelements thereof) can be used in combination with each other. Otherembodiments can be used, such as by one of ordinary skill in the artupon reviewing the above description. Also, various features or elementscan be grouped together to streamline the disclosure. This should not beinterpreted as intending that an unclaimed disclosed feature isessential to any claim. Rather, inventive subject matter can lie in lessthan all features of a particular disclosed embodiment. Thus, thefollowing claims are hereby incorporated into the Detailed Description,with each claim standing on its own as a separate embodiment. The scopeof the invention should be determined with reference to the appendedclaims, along with the full scope of equivalents to which such claimsare entitled.

In this document, the terms “a” or “an” are used to include one or morethan one, independent of any other instances or usages of “at least one”or “one or more.” In this document, the term “or” is used to refer to anonexclusive or, such that “A or B” includes “A but not B,” “B but notA,” and “A and B,” unless otherwise indicated. In this document, theterms “about” and “approximately” or similar are used to refer to anamount that is nearly, almost, or in the vicinity of being equal to astated amount.

In the appended claims, the terms “including” and “in which” are used asthe plain-English equivalents of the respective terms “comprising” and“wherein.” Also, in the following claims, the terms “including” and“comprising” are open-ended, that is, an apparatus or method thatincludes elements in addition to those listed after such a term in aclaim are still deemed to fall within the scope of that claim. Moreover,in the following claims, the terms “first,” “second,” and “third,” etc.are used merely as labels, and are not intended to impose numericalrequirements on their objects.

The Abstract is provided to allow the reader to quickly ascertain thenature of the technical disclosure. It is submitted with theunderstanding that it will not be used to interpret or limit the scopeor meaning of the claims.

1. A set screw apparatus comprising: a set screw including: a set screwbody; one or more set screw threads extending radially outwardly fromthe set screw body and disposed along a threaded set screw area of theset screw body, the threaded set screw area including a first lengthmeasured longitudinally along the set screw body; and an abutmentextending radially outwardly from the set screw body and longitudinallyseparated from the threaded set screw area by an unthreaded set screwarea of the set screw body, the unthreaded set screw area including asecond length measured longitudinally along the set screw body; and ablock including: a bore sized and shaped to accept the set screw withinthe bore; and one or more block threads extending radially inwardly fromthe bore and disposed along a threaded block area of the bore, the oneor more block threads being complementary with the one or more set screwthreads so as to be threadably engageable with the one or more set screwthreads, the threaded block area including a third length measuredlongitudinally along the bore, wherein the abutment is sized and shapedto abut, but not threadably engage with, the one or more block threadsto inhibit movement of the set screw past the threaded block area andremoval of the set screw from the bore, the third length being shorterthan the second length so that an entirety of the threaded block areacan be disposed within the unthreaded set screw area between thethreaded set screw area and the abutment, such that, with the threadedblock area disposed within the unthreaded set screw area: the set screwis freely rotatable within the bore, but retained within the bore, ifturned in a first direction with respect to the block; and the one ormore set screw threads are threadably engageable with the one or moreblock threads to move the set screw in an inward direction with respectto the block with the set screw turned in a second direction withrespect to the block.
 2. The set screw apparatus of claim 1, wherein theabutment is integrally formed with the set screw body.
 3. The set screwapparatus of claim 1, wherein the set screw body includes a cylindricalshape.
 4. The set screw apparatus of claim 1, wherein the set screw bodyis substantially tubular.
 5. The set screw apparatus of claim 1, whereinthe abutment is disposed proximate a distal end of the set screw body.6. The set screw apparatus of claim 1, wherein the abutment issubstantially annular.
 7. The set screw apparatus of claim 1, whereinthe threaded set screw area is disposed at a proximal end of the setscrew body.
 8. The set screw apparatus of claim 1, wherein the blockincludes a passage fluidly coupled with the bore, the passage configuredto selectively accept a proximal end of a therapy delivery element,wherein, with the proximal end of the therapy delivery element disposedwithin the passage, rotation of the set screw in the second directionwith respect to the block causes the set screw to move in the inwarddirection with respect to the block to bear against the proximal end ofthe therapy delivery element.
 9. The set screw apparatus of claim 8,wherein the passage is oriented within the block substantiallyperpendicularly to the bore.
 10. The set screw apparatus of claim 1,wherein the set screw includes a tool engagement opening configured toaccept at least a portion of a tool within the tool engagement openingto facilitate rotation of the set screw with respect to the block. 11.The set screw apparatus of claim 10, wherein the tool engagement openingis configured to allow engagement of at least the portion of the toolwith the tool engagement opening from a proximal end of the set screwbody and from a distal end of the set screw body.
 12. The set screwapparatus of claim 10, wherein the tool engagement opening extendsentirely through the set screw body to allow engagement of at least theportion of the tool with the tool engagement opening from the proximalend of the set screw body and from the distal end of the set screw body.13. A set screw apparatus comprising: a set screw including: a set screwbody including a proximal end and a distal end; one or more set screwthreads extending radially outwardly from the set screw body anddisposed along a threaded set screw area of the set screw body, thethreaded set screw area including a first length measured longitudinallyalong the set screw body, the threaded set screw area disposed at theproximal end of the set screw body; an abutment extending radiallyoutwardly from and integrally formed with the set screw body andlongitudinally separated from the threaded set screw area by anunthreaded set screw area of the set screw body, the unthreaded setscrew area including a second length measured longitudinally along theset screw body, the abutment disposed proximate the distal end of theset screw body; and a tool engagement opening within the set screw body,the tool engagement opening configured to accept at least a portion of atool within the tool engagement opening, the tool engagement openingextending entirely through the set screw body to allow engagement of atleast the portion of the tool with the tool engagement opening from theproximal end of the set screw body and from the distal end of the setscrew body; and a block including: a bore sized and shaped to accept theset screw within the bore; and one or more block threads extendingradially inwardly from the bore and disposed along a threaded block areaof the bore, the one or more block threads being complementary with theone or more set screw threads so as to be threadably engageable with theone or more set screw threads, the threaded block area including a thirdlength measured longitudinally along the bore, wherein the abutment issized and shaped to abut, but not threadably engage with, the one ormore block threads to inhibit movement of the set screw past thethreaded block area and removal of the set screw from the bore, thethird length being shorter than the second length so that an entirety ofthe threaded block area can be disposed within the unthreaded set screwarea between the threaded set screw area and the abutment, such that,with the threaded block area disposed within the unthreaded set screwarea: the set screw is freely rotatable within the bore, but retainedwithin the bore, if turned in a first direction with respect to theblock; and the one or more set screw threads are threadably engageablewith the one or more block threads to move the set screw in an inwarddirection with respect to the block with the set screw turned in asecond direction with respect to the block.
 14. The set screw apparatusof claim 13, wherein the set screw body includes a cylindrical shape.15. The set screw apparatus of claim 13, wherein the set screw body issubstantially tubular.
 16. The set screw apparatus of claim 13, whereinthe abutment is substantially annular.
 17. The set screw apparatus ofclaim 13, wherein the block includes a passage fluidly coupled with thebore, the passage configured to selectively accept a proximal end of atherapy delivery element, wherein, with the proximal end of the therapydelivery element disposed within the passage, rotation of the set screwin the second direction with respect to the block causes the set screwto move in the inward direction with respect to the block to bearagainst the proximal end of the therapy delivery element.
 18. The setscrew apparatus of claim 17, wherein the passage is oriented within theblock substantially perpendicularly to the bore.